The Cfit + Fitness Tracker is basically one of the most basic easy-to-use fitness trackers that gives you extremely precise data (Heart Rate Monitor, Blood pressure, Oxygen level indicator etc.)
I'd say this is the entry-level bracelet for anybody who never had one before, for kids or people who just like simplicity. IP67 Waterproof, it is the best bracelet for you if you want to get in shape or need it for a medical reason.

Don't let the price fool you; I had to do A LOT of testing before I was finally able to find one under 50$ that would still give you the same precision that any other trackers would do.

Compatible with ANY smartphone, once it is paired all your text SMS, Facebook notifications, Twitter, Instagram, Wechat and more will be forwarded onto the bracelet. It's also the perfect tool if you're trying to take it to the next level at the gym. Calories counter, distance travelled and the possibility to track your progress for months, the Cfit is the perfect device for anyone looking to get started but doesn't want to spend hundreds of dollars for one.

Specifications & Features

• SUPPORT: The Cfit is Compatible with any smartphone (iPhone 5, 6, 6s, 7, 7s, Android, Samsung, Huawei, Google Pixel, LG etc.) 

• SLEEP MONITORING:  Accurately monitors your sleeping cycles, giving you the exact amount of time you were in the light cycle, deep sleep (REM) or woke up at one point to go drink water.

• NOTIFICATIONS: SMS notifications, Caller ID, Alarm, Facebook, Twitter, Whatsapp, WeChat, Instagram, Skype, KakaoTalk, etc

• PEDOMETER: Calories Calculation, Distance Calculation, Step Tracker, Run, Bike, etc

• WATERPROOF: IP67 verified (1m underwater)

• GREENLIGHT SENSOR: Using a green light sensor on your wrist, you can get live tracking of your heart rate, blood pressure, oxygen % with your sex, height and weight to give you an accurate number of calories you burn per day.